A250314 Number of length n+2 0..2 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero

5, 25, 41, 161, 487, 1689, 5849, 19981, 67459, 221953, 709677, 2225181, 6874957, 21019457, 63845081, 193077349, 582247055, 1752693185, 5269930487, 15833493125, 47548549519, 142743601321, 428431672069, 1285708580949, 3857979555851

Offset

1,1

Comments

Column 2 of A250320

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

Some solutions for n=6
..2....1....1....2....0....1....0....2....1....1....1....0....0....0....1....1
..2....0....0....2....1....0....2....1....1....0....1....1....0....2....0....1
..1....0....0....0....1....0....2....1....1....0....2....0....1....1....0....1
..0....0....0....1....2....1....1....2....1....1....2....2....1....1....0....1
..1....0....2....1....1....0....0....1....1....2....1....0....2....2....0....2
..2....1....0....2....1....2....1....1....1....2....0....0....2....1....0....0
..2....1....1....0....1....2....1....1....0....2....1....0....0....2....1....0
..0....0....0....2....0....1....1....2....0....1....1....1....0....2....2....2

Crossrefs

Sequence in context: A099799 A093534 A070388 * A293571 A294256 A056872

Adjacent sequences: A250311 A250312 A250313 * A250315 A250316 A250317

Keyword

nonn

Author

R. H. Hardin, Nov 18 2014

Status

approved